Did not work.
When I try to open the calendar app I get a screen with absolutely no calendar info, and no mention of calendar or calendars. There is only the info across the top about AT&T and wi fi signal strength, time, battery charge level, blue tooth "on", and a little arrowhead icon which I don't know the meaning of (?). Immediately below this is a fine line about 1/2 inch from the top from left to right. Then blank space down to another fine line about 1/2 inch from the bottom running from left to right. NOTHING ELSE ON THIS SCREEN.
Wi Fi is on, cellular data is on, and the Calendar switch is on.
My calendar data is on iCloud. I went on my iPhone to Settings/iCloud and turned calendar off. Waited 30+seconds and turned it back on.
STILL NO CALENDAR INFO ON iPHONE.
Any other ideas?